Joint Electrical and Time Domain Electromagnetism (TDEM) Data Inversion Applied to the Super Sauze Earthflow (France) |
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| Authors: | Myriam Schmutz Yves Albouy Roger Guérin Olivier Maquaire Jacques Vassal Jean-Jacques Schott Marc Descloîtres |
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| Institution: | (1) Centre d Etudes et de Recherches Eco-Géographiques (CEREG), UMR 7007 CNRS/ULP/ENGEES, 3 rue de lArgonne, 67083 Strasbourg Cedex, France;(2) Ecole et Observatoire des Sciences de la Terre (EOST), Université Louis Pasteur, Strasbourg, France;(3) Département de Géophysique Appliquée, Université Pierre et Marie Curie, Paris, France;(4) Centre dEtudes et de Recherches Eco-Géographiques (CEREG), UMR 7007 CNRS/ULP/ENGEES, 3 rue de lArgonne, 67083 Strasbourg Cedex, France |
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| Abstract: | In order to evaluate the risk of an earthflow to evolve abruptly into torrential surge, knowledge of its internal structure is necessary. This study deals with the internal structure of the Super Sauze earthflow developed in black marls in the southern French Alps. Difficulties in this study area are a rough topography, surface heterogeneities and a large thickness variability of the earthflow mass. These conditions hamper the application of geotechnical methods as a preferred investigation mean. Moreover, they pose problems to geophysical investigations and their interpretation.This paper shows the advantage offered by the joint inversion of Time Domain ElectroMagne-tism data (TDEM) and data obtained from Direct Current soundings (DC). The results of the joint inversions are checked using geotechnical data. The internal structure of the earthflow interpreted on the basis of joint inversion data is comparable to that obtained from geotechnical results. Moreover, contrary to separate electrical and TDEM inversions, a satisfactory joint inversion model can be derived without supplying additional a priori information. |
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| Keywords: | electrical and TDEM prospecting earthflow joint inversion Simultaneous Electromagnetic Layered Model Analysis (SELMA) software |
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